Arc lamp



ARC LAMP Filed July l5, 1929 2 Sheets-Sheet l Ot. 4, 1932. G. c. RAucH ET AL ARC LAMP Patented Oct. 4, 1932 UNITED STATES PATENT OFFICE GEORGE C. RAUCH AND JAMES W. PLUNKETT, ST. LOUIS, MISSOURI; SAID .'PLUNKETT ASSIGNOR T SAID RAVUCH ARG LAMP Application led July 15,

This invention relates to are lights and has special reference to a device for producrays for therapeutical purposes.

. An object of the invention is to provide an arc light device with improved means for adjusting the points of the carbons the same distance apart automatically and as an incident to the use of the device, irrespective of the length or any variation in the length of the carbons.

Other objects will appear from the following description, reference being made to the accompanying drawings in which- ,F ig. 1 is a side elevation of the invention applied in a reflector for therapeutic uses, parts being in section.

Fig. 2 is a rear elevation of the device, the rear portion of the supporting frame being in section.

Fig. 3 is a sectional view approximately on the line 3&3 of Fig. 1.

Fig. 4 is an enlarged sectional view of thel mechanism for automatically adjusting the carbons when the device is used.

Fig. 5 is a sectional view approximately on the line 5 5 of Fig. 4.

Fig. 6 is an enlarged vertical sectional view of the` dashpot device for retarding the movement of one of the carbon supports when the actuator hereof is energized.

Fig. 7 isa cross sectional View of the dashpot device.

A useful embodiment of the invention as shown comprises a reflector 1 having on the inside thereof an outwardly convex reflector wall 2 provided with a vertical slot 3.

The carbon 4.- projects through the slot 3 into a socket 5 andis secured in said socket by a set screw 6. The socket 5 has arms 7 seating against a piece of insulating material 8 attached to the inside of the reflector 1. Screws 9 secure the arms 7 to the insulation 8 in such a way that the socket 5 is insulated from the reflector 1.

The reflector 1 is attached to a frame 10 which is adjustable on a clamping pivot 11 mounted on the upper end of a support 12.

The pivot 11 is a"horizontal pivot and the refiector 1 may be turned about the horizontal axis of the pivot 11 in order properly 1929. Serial No. 378,204.

to direct the light. The pivot 1l is equipped with a nut 13 wliielrinay be adjusted to permit movement of the frame 11, and tohold said frame in any adjustment in Which it is placed.

The rear end of the reflector 1 has therethrough an opening 14. The carbon 15 has one end secured in a socket 16 by a set screw 1-7. The socket 16 is attached to the end of a supporting lever 18 by a screw19 which may be removed to permit detachment and replacement of the socket 16. The lever 18 is mounted on a pivot 20 supported by the frame 10 'and is connected withthe upper end of a rod 21. The rod 21 extends for sliding movements through a central opening in the upper end wall 22 of a dashpot cylinder 23. The upper end wall 22 of said dashpotl cylinder has vents 24'to permit passage of air into and fromv the dashpot. 'The cylinder 23 is mounted on a pivot 25 supported by the frame l1() and contains a quantity of oil or other appropriate liquidffor retarding the movements of the dashpotpiston 26' enclosed Within said cylinder 23 and attached to the lower end of the rod 21. 1 The piston 26 has therethrough openings 27 through which the oil may'pass. A disc 28 is mounted loosely on the rod 21 above the piston 26 and is actuated downwardly by a spring 29. The spring 29 encircles the rod 21 and has its upper end firing againstV an abutment `30 on said rod and its lower end pressing againstthe disc 28. A screw31 extends through the piston 26 and supports one edge of the disc 28 in opposition to the pressure of the spring 29. Thus the-disc 28 is supported in a tilted or inclined position so as 4to-eonstitute a baffle above theholes 27 to permit and yetretard passage of oil through saidholes when the piston is reciprocated.

An electric circuit wire J 32 leads to an electro-magnet device 33 from which a wire 34 extends to connection With a resistance coil 35 mounted on a support 36. The support 36 is mounted in the frame 10 and insulates the coil 35 from said frame. The coil 35 has an extension 37 to a binding post 38 attached to the socket 16. The other circuit wire 39 extends to connection 40 with the socket 5.

An armature has arms 41 extending through the course of the electro-magnet device. The lower end of the arms 41 have a cross connection 42 connected by insulating members 43 withl a supporting device 44 mounted on a pivot 45 in the frame 10. The connection between the parts 43 and supporting device 44 is pivotal so that the armature may move freely. A cross connection 46 between the upper ends of the arms 41 of the armature is pivotally connected with the le'- ver 18 by insulating pieces 47.

When the circuit is closed through the wires 32 and 39 the electro-magnet device 33 is energized, thearmature 41 is raised to a position in which the carbon stem 15 is approximately parallel with the carbon stem 14 and is supported in such position during the time that the circuit remains closed., The resistance coil affects the electric energy to the carbon stem 15 in the intended member. The dashpot device with which the lever 18 is connected by the rod 21 retards the movement of the armature by the electromagnet so that there `is-no violent or sudden movement. The dashpot device controls the movement of the armature so that the spacing of the carbon 15 from the carbon stem 4 is gradual and there is no sudden nor Violent movement of these parts. When the circuit is open and the electro-magnet becomes deenergized, the carbon stem 15 is lowered toward the carbon stem 4 by the weight of the parts and such movement is gradual.

It is now apparent that our invention obtains all of its intended objects and purposes in a highly eiicient, automatic and satisfactory manner. The construction, yarrangement and relationship of the parts of the invention may be varied within equivalent limits without departure from the nature and principle thereof. We do not restrict ourselves unessentially but what We claim and desire to secure by Letters Patent is 1. A device of the character described comprising a frame, aV carbon holder attached to said frame, a pivot supported by said frame, a lever mounted on said pivot, a carbon holder attached to said lever, an actuator pivoted tosaid-lever between said pivot and said second carbon holder, a link pivotally connecting said actuator withsaid frame,

vmeans for moving vsaid actuator to move said second carbon holder toward and away from said first carbon holder, and a device connected with and controlling movement of said lever by said actuator.

2. A device of the character described comprising a frame, a carbon holder attached to said frame, a lever, aV pivot supporting said lever in said frame, a carbon holder attached to said lever, an actuator having one end pivoted to said lever, a link pivotally connecting the opposite end of said actuator with said frame, and means for operating said actuator to move said lever and thereby said second carbon holder toward and away from said iirst carbon holder.

GEORGE C. RAUCH.

JAMES WV. PLUNKETT. 

